Experimental Analysis on Crack Initiation Stress and Rupture Energy of Marble Failure
Zhang Liming,Gao Su,Ren Mingyuan and Wang Zaiquan
DOI:10.11835/j.issn.1674-4764.2014.04.011
Received January 26, 2013,Revised , Accepted , Available online July 01, 2015
Volume ,2014,Pages 69-73
- Abstract
Based on the marble conventional triaxial test data, the crack initiation stress and rupture energy under different confining pressures are analyzed. Results showed that the crack initiation position is gradually close to the peak strength point with the increase of the confining pressure. The location of the crack initiation occurs in 50% ~70% peak strength. The rupture energy and confining pressure are in positive linear relationship as well as the rupture energy and peak axial stress. And sudden increase of AE energy count corresponds with the crack initiation stress. AE energy count and cumulative energy increase quickly after the crack initiation position, which increase significantly in the crack initiation point. The crack initiation point of theoretical calculation is in good agreement with acoustic emission monitoring. Mogi-Coulomb criterion is in keeping with experimental results.